The theory of variational inequalities, with its wide range of applications in engineering, economics, finance, industy and mechanics, has become a well-established and fruitful area of research. After the fundamental work of Lions & Stampacchia [15], this theory have been studied intensively. With the contributions of Brézis [8], [9], Duvaut Lions [11], Browder [10], Kinderlehrer & Stampacchia...
